(a(i)(1))[2]
Assume air resistance is negligible. Calculate the time for the ball to reach the ground.
(a(i)(2))[2]
Assume air resistance is negligible. Calculate the ball’s maximum kinetic energy.
(a(ii))[1]
State and explain how the ball’s velocity changes with time as it falls to the ground.
(a(iii))[1]
Show that the ball’s speed on reaching the ground is about $60\text{ m s}^{-1}$.
(b(i))[3]
In real conditions, air resistance is not negligible. Use Fig. 3.2 to state and explain qualitatively how the ball’s acceleration varies with the distance it has fallen.
(b(ii))[2]
The ball’s speed becomes $40\text{ m s}^{-1}$. Calculate its acceleration at this speed.
(b(iii))[2]
Use information from (a)(iii) and Fig. 3.2 to state and explain whether or not the ball reaches terminal velocity.